pinion angle

Can some one tell me what your pinion angle is and what shims are and where they go. I have searched the through some threads but havent found anything that hits it right on the head, please help me out.

What year, axle, SYE, etc?

On my 92 with NP231/AW4 with C8.25" rear axle I have an RE SYE and DS with a 4 degree shim set. No vibes at all.

http://www.4xshaft.com/driveline101.html

This might help a little, Mine is set 2 degrees low compared the to angle of the driveshaft, but I have a SYE.

shims go between the perch and the leaf to rotate the pinion up or down depending on the amount of degree your shims have